diff --git a/private_message.module b/private_message.module
index 1b2eda5..f400982 100644
--- a/private_message.module
+++ b/private_message.module
@@ -352,7 +352,7 @@ function private_message_form_user_admin_settings_alter(array &$form, FormStateI
       '#default_value' => $mail_config->get('message_notification.body'),
     ];
 
-    $form['actions']['submit']['#submit'][] = 'private_message_user_admin_settings_submit';
+    $form['#submit'][] = 'private_message_user_admin_settings_submit';
   }
 }